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How can I quickly sum all numbers in a file?
...cause I was hoping using mmap would be really fast, but it's just the same time:
use 5.010;
use File::Map qw(map_file);
map_file my $map, $ARGV[0];
$sum += $1 while $map =~ m/(\d+)/g;
say $sum;
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Tools for analyzing performance of a Haskell program
...so slow. Are there any commands that tell me where most of the computation-time is spend so I know which part of my haskell-program is slow?
Precisely! GHC provides many excellent tools, including:
runtime statistics
time profiling
heap profiling
thread analysis
core analysis.
comparative benchm...
Javascript seconds to minutes and seconds
...mber of total seconds by 60 (60 seconds/minute):
var minutes = Math.floor(time / 60);
And to get the remaining seconds, multiply the full minutes with 60 and subtract from the total seconds:
var seconds = time - minutes * 60;
Now if you also want to get the full hours too, divide the number of...
How to convert local time string to UTC?
How do I convert a datetime string in local time to a string in UTC time ?
21 Answers
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How can I repeat a character in Bash?
...epeat 1000000 1000
#!/usr/bin/env bash
title() { printf '%s:\t' "$1"; }
TIMEFORMAT=$'%6Rs'
# The number of repetitions of the input chars. to produce
COUNT_REPETITIONS=${1?Arguments: <charRepeatCount> [<testRunCount>]}
# The number of test runs to perform to derive the average timin...
Appending the same string to a list of strings in Python
... s+mystring
i = i + 1
Experiment
import random
import string
import time
mystring = '/test/'
l = []
ref_list = []
for i in xrange( 10**6 ):
ref_list.append( ''.join(random.choice(string.ascii_lowercase) for i in range(10)) )
for numOfElements in [5, 10, 15 ]:
l = ref_list*numOfEl...
What do 'real', 'user' and 'sys' mean in the output of time(1)?
What do 'real', 'user' and 'sys' mean in the output of time?
6 Answers
6
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Bash tool to get nth line from a file
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For those wondering, this solution seems about 6 to 9 times faster than the sed -n 'NUMp' and sed 'NUM!d' solutions proposed below.
– Skippy le Grand Gourou
Feb 18 '14 at 16:48
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Associative arrays in Shell scripts
...t a "bad array subscript" error but don't how to validate the input at the time of array lookup, if that's possible?
– Jer
Feb 5 '14 at 19:02
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How can I generate Unix timestamps?
Related question is "Datetime To Unix timestamp", but this question is more general.
18 Answers
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